题目内容
已知M=则M∩N=
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已知M={1},N={1,2},设A={(x,y)|x∈M,y∈N},B={(x,y)|x∈N, y∈M},求A∩B,A∪B.
已知M={1},N={1,2},设A={(x,y)|x∈M,y∈N},B={(x,y)|x∈N,y∈M},求A∩B和A∪B.